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[Bug math/14803] Different ULPs depending on size of long int in GCC
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Sun, 04 Nov 2012 23:05:35 +0000
- Subject: [Bug math/14803] Different ULPs depending on size of long int in GCC
- Auto-submitted: auto-generated
- References: <bug-14803-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=14803
--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-04 23:05:35 UTC ---
(In reply to comment #1)
>
> Really I'd consider this just a variant on bug 21718 (real.c rounding not
> perfect). That would ideally be fixed by using MPFR for this in GCC ...
> except that for any MPFR versions before 3.1.1p2, the bug I found with the
> ternary value from mpfr_strtofr could cause problems for subnormal
> results.
>
Fedora 17 has mpfr-3.1.0. So most of system MPFR won't be suitable for
this.
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